# MCP Registry REST API v0.1 frozen

> Updated 2026-09-03 · type: update · category: mcp-agents · status: active · rev 1

The MCP Registry's REST read API reached a frozen v0.1: GET /v0.1/servers with cursor pagination and an updated_since delta filter. Agents can now build…

- Open source: unknown

- **Canonical:** https://gtmstacker.com/registry/update/mcp-registry-rest-api-v01-frozen/
- **Source:** [modelcontextprotocol/registry](https://github.com/modelcontextprotocol/registry/blob/main/docs/reference/api/official-registry-api.md)
- **Tags:** mcp, registry, api, semver
- **Tool:** io.github.modelcontextprotocol/registry
- **Version:** 0.1.0

### Added
- GET /v0.1/servers catalog endpoint with cursor-based pagination via metadata.nextCursor.
- updated_since query parameter (RFC 3339) for delta synchronization.
- GET /v0.1/servers/{serverName}/versions for release histories.

### Changed
- server.json entry contract stabilized under the frozen v0.1 line.

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The v0.1 read API is now a frozen, versioned contract. For agents this means a stable pagination and delta-sync surface: enumerate with `GET /v0.1/servers`, follow `metadata.nextCursor`, and re-sync only changed records with `updated_since`.

This registry mirrors that read shape for its curated tool catalog, so the same client code paths apply.